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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 461

Sense milliamps to kiloamps and digitize to 12 bits

Richard Markell and Glen Brisebois

Abstract

The LT1787 high side current sense amplifier, which provides an easy-to-use method of sensing current with 12-bit resolution for a multiplicity of application areas, is described.

Keywords

Current sense amplifier

LT1787

Introduction

The LT1787 high side current sense amplifier provides a precision measurement of current into or out of a power source. The part generates an output voltage that is directly proportional to the current flowing through an external current sense resistor. With a miniscule 40μV (typical) input offset voltage, the LT1787 has a better than 12-bit, zero-cross accurate dynamic range at 250mV full-scale ...

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